block.m

#include <stdio.h>

typedef int (^complicated_block)(int, int);
typedef int (^simple_block)(int);

int main(int argc, char *argv[]) {
   complicated_block pow = ^(int n, int power) {
      int ret = 1;
      for (int i = 0; i < power; i++)
         ret *= n;
      return ret;
   };

   simple_block pow2 = ^(int power) {
      return pow(2, power);
   };

   printf("2^3 = %d\n", pow2(3));

   return 0;
}